Question

Read character from the keyboard into R0 using trap_getc. Write the character from R0 to ASCII display using trap_putc. Repeat the loop until loop_end.

Answer 1

loop_start:

; Read character from the keyboard into R0 using trap_getc

trap_getc R0

; Check if the character is the end of the loop

; (Assuming loop_end is a specific character or condition)

compare R0, loop_end

branch_equal loop_exit

; Write the character from R0 to ASCII display using trap_putc

trap_putc R0

; Continue the loop

branch loop_start

loop_exit:

; Your code after the loop ends goes here

Answer 2

The given assembly code reads a character from the keyboard into register R0 using trap_getc and writes the character to the ASCII display using trap_putc. The loop continues until the loop_end condition is met.

Step-by-step explanation:

Reading Character (trap_getc):

The instruction trap_getc is a system call that reads a character from the keyboard, and the value is stored in register R0.

Writing Character (trap_putc):

The instruction trap_putc is a system call that writes the character from register R0 to the ASCII display.

Looping (until loop_end):

The code includes a loop structure where the instructions inside the loop are repeated until the loop_end condition is satisfied. The exact conditions determining loop termination are not provided in the given snippet.

Execution Flow:

The code creates a continuous loop, repeatedly reading a character from the keyboard and displaying it on the ASCII display.